Drying-kiln.



No. 820,865. PATENTED MAY 15, 1906.

J. P. HANRAHAN.

DRYING KILN.

APPLIUATION FILED MAR.31,1905.

' 3SEBETS-BHBBT 1.

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' F :Jnuautozg PATENTED MAY 15, 1906.

J, F. HANRAHAN.

DRYING KILN. APPLIUATION FILED MAILBI, 1905 3 SHEETS-SHEET 2.

3 affofu wv No. 820,865. PATENTED MAY15, 1906. 1. F. HANRAHAN.

DRYING-KILN. APPLIGATION FILED MAE-31, 1905.

3 SHEETS-BHEBT 3.

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llw l lll lGi hiltl tu Specification of Letters Patent.

l atentecl Illrltay 15. 1906.

Application filed March 31, 1905. Serial No. 253,098.

To (1.7/ [rim/ii may; concern:

Be it known that l, Jlosnrn F. HANRAHAN, a subject of the Kine oi" Great Britain, residing at Bullalo, in the county of Erie and some of New York, have invented certain new and useful Improvements in Drying-- .l iilns, of which the following is a specification.

My present invention 'iertains to improve-- ments in drying-kilns, the construction and advantages of which. will he hereinafter set Forth, reference being had to the annexed drawings, whereinllignre l a transverse sectional View of a hattcry of kilns; Fig. 2, a longitudinal sec-- tional view taken on the line :2 2 of Fig. 1, and 3 a transverse sectional View of a lIlQtlh lied .lorm ol kiln. I

The object ol my invention is to provide a kiln in which all portions of the material under treatment shall be equally sul-jected to the action ol" the air which is drawn therethrough, the arrangement. being such that the air is evenly distributed therein.

With the construction, hereinafter set forth in detail the air is brought in the full.

length of the chamber or kiln :HHlfiOIDPlGCOly distribiited from one wall thereof to the opposite wall before it comes under the influcncc ol'- the heat radiating from the heatingiipes, An opening or outlet for the moislure-laden air is also provided, which outlet extends the full length of the chamber. Suitable regulators are employed to control the llow ol" the air into and out of the kiln, thereby controlling the ell'ect of the air upon the lumber or other material and preventing in the first instance a too rapid drying thereot, which will have a tendency to case-harden the same and prevent the moisture from passing. out. l'roni the center or core of the wood.

llel'erring l rst. to Figs. 1 and 2, A, B, and 0 denote a series or battery of kilns each provided with cross-bars or sup'orts D, upon which are mounted tracks E for thereception of trucks or carriers for the lumber or otl "r material to be dried. Heatin -pipes F nrc mounted upon oi supported by t 1e erossbars U, which bars, as will be seen upon reference to the drawinganre located it consider ahle distilnco above the floor oi the kiln. An air inlet or lluct G, provided with a suitable regulator ll, opens into the lower portion of the kiln at a distance below the cross-bars I).

This duct or inlet G extends the entire length of the kiln, so that the fresh air introduced the 'ethrough enters the kiln through its whole length. It desired, a deflector or battle-plate 1. may be employed at the lower end of the duct. or chamber (lto divert the air in the direction indicated by the arrows in. the drawings. The air entering" by the duct being spread over the liner of the kiln from side to side will gradually pass upwardly and come under the influence of the heat radiated from the pipes. its the air becomes l'ieatedv it will naturally ascend and be displaced by that drawn in through the duct. The heated air passes up through the charge and out by stack or outlet J, which is provided with. a regulator hi. Said stuck or outlet J likewise extends througluiiut the entire length of the kiln, so that the heated and moisture-laden air has a free exit l'roni the kiln. The rapidity with which the air passes from outlet J- and into the duct G will of course be determined by the degree of opeliing ol" the regu lators or valves ll and hi. [is before noted, when the lumber is lirst placed in the. kiln the degree of heat desired is somewhat lower than that employed during the later stages of the drying operation, and the valves are therefore adjusted accordingly.

In Fi 15 a slight modification ol. the invention is il ustrated. instead. ol employing the duct (i, which necessary in case a series or battery ol. kilns is used, at least for the innermost ones, 1 form an opening L at the lower portion of the kiln and provide a regulatingvalvo M for said opening. The dry cool air asses in through this o )ening beneath the heating-pi es and spreads from side to side of the kiln elore being ail'ected by or coming under the influence ol the heating-pi 98. As in the .l'oriner chnstruotion, the rapidity with which the air passes through the kilns may be regulated and doterinined by proper manipulation of the valve M and outlet-waive ii,

lorined'in the outlet assa 'e or this J. The

exact location. of the outlet or chimney isiln material. While I have shown it as placed it on the some side as the inlet lluait may 0' course he placed upon the opposite side. The form ol valve or damper for regulating the inflow and exit of the air is also innnate rial. Any form which will accomplish the purpose in View falls within the scope of my invention.

if desired, a curtain i may he employed, as shown in Fig. .2, to divide the kiln into an initial Inveatiiig-chainher andn linal dryingchamber the curtain being operated in the usual manner.

Having thus described my invention What I claim is 1. Ina dryingkiln the combination of a chamber provided with an air inlet extending substantially the entire length thereof near the bottom of the chamber and opening directly into the same said chamber being likewise provided with an opening in the up- P the located in the ehainber at a point substantially above the bottom thereof; means for regulating the amount of air )vhichmay pass into said chamber through the lower opening; and means for regulating the'ou-tflow of the air through said up er opening 2. In a drying-hi n, the combination of a chamber has? v an opening formed at the lowerortion t hereof said opening extending su stant-ially chamber and having 2 free and unobstructed inlet directly iutothe same, said chamber be ing likewise provided With an opening in the upper portion thereof extending substantially the len th, of the lating the size of said lower opening; a series of cross-bars or supports mounted. in the Iportion thereof extending substantially ength of the chamber; a1r-heetmg means the entire length of ythe chamber; means, for regu-- senses chamber; a series of heatingpipes supported by said cross-bars the bars and pipes being elevated sufiiciently to permit the air which enters the opening in the lower ortion of the kiln to pass to the opposite si e thereof before coming entirely under the influence of the heat radiated from the pipes; and means for regulating the escape of the heated moisture-laden air through said upper opening.

3. In a drying-kiln the combination of a chamber provided with an air'inlet extending substantially the entire length thereof near the bottom of the chamber and opening JOSEPH F. HANRAHAN. Witnesses:

Josnrn E. GA rN,

H. Molnrnn.

- directly into. the same said chamber 

